package cn.xxm.utils;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.EnvironmentAware;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;

/**
 * spring 上下文工具类
 */
@Component
public class ContextUtil implements ApplicationContextAware,EnvironmentAware {

    private static ApplicationContext applicationContext;

    private static Environment environment;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if(ContextUtil.applicationContext == null) {
            ContextUtil.applicationContext = applicationContext;
        }
    }


    /**
     * 获取applicationContext
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

     /**通过name获取 Bean.
     * @param name
     * @return
     */
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    /**通过class获取Bean.
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

    /**通过name,以及Clazz返回指定的Bean
     * @param name
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(String name,Class<T> clazz){
        return getApplicationContext().getBean(name, clazz);
    }



    @Override
    public void setEnvironment(Environment environment) {
        if(ContextUtil.environment == null) {
            ContextUtil.environment = environment;
        }
    }

    /**
     * 获取environment
     */
    public static Environment getEnvironment() {
        return environment;
    }
}
